Error in Drag and Drop quiz done of Flash - actionscript-3

Question

I am trying to create a drag and drop game on flash. But i end up got one error, syntax error of #error1083,else is unexpected.
The error shows at the line 42, and i dont have any idea which line should i did mistake.
Can someone tell me what is wrong with the code?
Here is the codes
import flash.events.MouseEvent;
var objectoriginalX:Number;
var objectoriginalY:Number;
blue.buttonMode = true;
blue.addEventListener(MouseEvent.MOUSE_DOWN, pickObject);
blue.addEventListener(MouseEvent.MOUSE_UP, dropObject);
green.buttonMode = true;
green.addEventListener(MouseEvent.MOUSE_DOWN, pickObject);
green.addEventListener(MouseEvent.MOUSE_UP, dropObject);
red.buttonMode = true;
red.addEventListener(MouseEvent.MOUSE_DOWN, pickObject);
red.addEventListener(MouseEvent.MOUSE_UP, dropObject);
function pickupObject(event:MouseEvent):void
{
event.target.startDrag();
event.target.parent.addChild(event.target);
objectOriginalX = event.target.x;
objectOriginalY = event.target.y;
}
function dropObject (event:MouseEvent):void
{
event.target.stopDrag();
var matchingTargetName:String = event.target.name + "target" ;
var matchingTarget: DisplayObject = getChildByName(matchingTargetName);
if(event.target.dropTarget != null && event.target.dropTarget.parent == matchingTarget);
{
event.target.removeEventListener(MouseEvent.MOUSE_DOWN,pickupObject);
event.target.removeEventListener(MouseEvent.MOUSE_UP,dropObject);
event.target.buttonMode = false;
event.target.x = matchingTarget.x;
event.target.y = matchingTarget.y;
}
else { // here is where i got error 1083
event.target.x = objectOriginalX;
event.target.y = objectOriginalY;
}
}

Answer 1

Remove ; at the end of the line:
if(event.target.dropTarget != null && event.target.dropTarget.parent == matchingTarget);

Answer 2

Regarding objectOriginalX and friends, the problem is that you are not initializing the variables. Unlike int, which initializes to 0, Number variables don't initialize to actual values, instead they are NaN (not-a-number). You must set those values before you use them in calculation, as in...
var objectoriginalX:Number = 0;
var objectoriginalY:Number = 0;
...or set them to their starting points first. Also, you might be trying to add pickObject before you've initialized it. Object initializes to null, so you need to assign pickObject to something before it gets used. For example, in this line...
blue.addEventListener(MouseEvent.MOUSE_DOWN, pickObject);
...does pickObject exist yet? It must not be null; it must be assigned before you use it.